# Numeracy Resources

## Geometry & Measurement

### 3-Act Lesson: Volume of a Cylinder

A 3-act lesson starts with a quick video or visual that makes students wonder. In the videos for this 3-act lesson, Jenn Vadnais offers students a chance to consider the volume of a cylinder of Playdoh.

### AREA: Big Cheez-its & Multiplication and Rectangles

Two children discuss whether "Big Cheez-its" are really twice as big as regular Cheez-its. While the learners in this case are children, numeracy students of all ages could enjoy exploring area with a similar question.

### Circles, Lines and Angles

A teacher describes a strategy for students to engage with the content and activate prior knowledge at the beginning of a geometry unit.

### Geometric Subitizing: A Different Kind of Number Talk

The discussion cards posted on this site can be used to discuss counting and grouping strategies with students. This could be a great way to engage students using vocabulary around numbers and shapes.

### How Big Is the Guatemala Sinkhole?

A fun and short activity from Robert Kaplinsky to find the volume of a sinkhole.

### One Formula to Rule Them All

Before you teach another formula for area of a 2-D shape, check out the "applets" on this page. Teachers who do not have access to internet in their classroom can learn from the animations and do a similar demonstration with paper.

### Piles of Tiles (3-Act Lesson)

A 3-act lesson starts with a quick video or visual that makes students wonder. This one from Graham Fletcher (gfletchy) is set up to ponder the concept of area.

### Pythagorean Theorem Visual Model

This YouTube video shows a visual model to help students understand the Pythagorean Theorem.

- Add-Subtract-Multiply-Divide
- Coherence
- Decimals
- Exponents
- Expressions
- Factors
- Fractions
- Levels of Knowing

### Uncovering Coherence Using Area Models

When is area more than area? In this recorded webinar, presenters Connie Rivera and Amy Vickers from the Adult Numeracy Network (ANN) explore coherent mathematical content that can be addressed using mathematical arrays.

### Weird Conversation About Perimeter

A teacher's conversation with a student about what perimeter means.

### Which Mistake to Pursue?

This blog post describes a class's exploration of an open-ended perimeter problem.

### Which toilet uses less water?

Fun and applicable real life activity from Robert Kaplinsky that compares the amount of water used with different toilets.

### College & Career Readiness (CCR) Math Standards

Looking for more specific information about the College & Career Readiness (CCR) Math Standards? Check out the **CCRS Math Resources** section of the CCR Standards resource library!